Using LSWS Std. 32-bit and Rails 64-bit

We had to switch to our servers to x86_64 Ubuntu 8.10 LTS recently. Running a production system with LSWS 4.0.x Enterprise and Ruby on Rails was no problem at all.
However there is a small server that only needs to run a Rails backend app. So there is no need for using and paying for the enterprise edition. But combining the 32-bit standard edition with an 64-bit OS and 64-bit Rails doesn't seem to work. LSWS starts up properly and does nice